Bunsen burner



April 1970 A.,M. VAN DER ZWAAL 3,506,198

BUNSEN BURNER Filed Feb. 19, 1968 2 Sheets-Sheet 1 FIGJ } I v H I x j 4 11 z 1a 11 M, 4:

FIG2 :2 1 1 5 19 INVENTOR 90594?) ANTDNIE M. VAN DER -zw L BY v x ATTORNEYS April 14, 1970 A. M. VAN DER ZWAAL BUNSEN BURNER 2 Sheets-Sheet 2 Filed Feb. 19, 1968 FIG-3 INVENTOR Awrowis M. VAN DER zwAAL eoas s BY y" ATTORNEY$ United States Patent 3,506,198 BUNSEN BURNER Antonie M. van der Zwaal, Stadhoudersweg 140C, Rotterdam, Netherlands Filed Feb. 19, 1968, Ser. No. 706,240 Int. Cl. Bb 7/06; F23d 13/40 US. Cl. 239432 ABSTRACT OF THE DISCLOSURE groove-shaped passage.

5 Claims The invention relates to a Bunsen burner having a gasinjection member, inlet apertures for rimary air, a mixing device for the gas and the air, and a burner nozzle formed with burner apertures.

In the prior art Bunsen burners of the kind specified, there is a risk that the flame will flash back when the burner is ignited. It is an object of the invention to provide a Bunsen burner of the kind specified which obviates this risk.

According to the invention the inlet apertures for the air each have a cap-shaped member which is formed by a boundary wall extending downwardly and outwardly at an inclination from the top edge of the aperture, and by vertical, outwardly directed boundary walls which are disposed symmetrically on either side of the aperture, starting from its side edges, abut by their outer edges the edges of the inclined boundary surface, and extend downwards to past the bottom edge of the aperture, so that each inlet aperture is adjoined by a groove-shaped passage having a downwardly directed inflow aperture for the air. The groove-shaped passage has a fairly large cooling wall surface, so that the flame cannot flash back. Moreover, the resulting groove-shaped passage is larger in the downward direction, with the extra advantage that less dust can get into the burner injection member from dusty surroundings, since the inflow speed is low, so that only a little dust is entrained, and any dust entrained into the passage can drop out; it escapes freely in the downward direction and does not get into the injection member.

In a very advantageous embodiment of the invention, the vertical walls are each connected by the edges extending on either side of an inlet aperture via a segment of a cylinder to a matching wall of the cap-shaped portion associated with the next aperture, all the segments engaging around that portion of the burner which comprises the injection member. The burner nozzle can therefore be attached to that portion of the burner which comprises the injection member by means of the cap-shaped member. Its special shape gives the cap-shaped member a certain resilience resulting in a clamping attachment.

According to the invention one or more segments of cylinders can have one or more inwardly directed projections or depressions which co-operate with depressions and projections respectively distributed regularly over the periphery of the portion comprising the injection member. With a construction of this kind, the burner nozzle can be placed in various accurately determined positions. This is important, for instance, if the injection member is placed on a burner casing, and a number of burner nozzles must be brought into the correct position in relation to one another on the associated injection member.

In a particularly advantageous embodiment of the invention, at least one of the cylindrical portions has a projection in the form of a pressed-in portion which can co operate with one of a number of depressions which are distributed regularly over the periphery of the portion comprising the injection member and extend axially over a short enough distance for the projection to be located both axially and peripherally in the depression. The depressions in the member comprising the injection member can be produced, for instance, by means of a knurling wheel, While the pressed-in portion can be produced during the manufacture of the cap-shaped member. When the nozzle is moved axially, the pressed-in portion snaps into a particular depression, while a snap effect also occurs when'the nozzle is rotated. In this way very advantageous use is made of the radial resilience of the cylindrical segments due to their particular shape.

Also according to the invention the cylindrical segments can have a circularly extending edge or groove which cooperates with an associated groove and edge respectively of the portion comprising the gas injection member. With this construction, the burner nozzle is satisfactorily located axially in relation to the member comprising the gas injection member.

A number of embodiments of the invention will now be described in greater detail in the following description, with reference to the drawings, wherein:

FIG. 1 is a plan view of a burner according to the invention;

FIG. 2 is a section, taken along the line 11-11 in FIG. 1;

FIG. 3 is a plan view from below of the burner shown in FIG. 1;

FIG. 4 is a section to an enlarged scale, taken along the line IVIV in FIG. 2;

FIG. 5 shows a variant embodiment of a portion of a burner, sectioned along the line V-V in FIG. 6, and

FIG. 6 is a section, taken along the line VI-VI in FIG. 5.

Referring to FIGS. 14, a burner consists of a nipple 1 to which a burner nozzle 2 is attached. The nipple 1 comprises a gas injection member 3. Air can be sucked in via apertures 4 and is supplied together with the gas to a mixing bush 5'. The gas-air mixture emerging from the mixing bush 5 backs up against a distributing member 6 and then passes to burner grooves 7.

The air inlet apertures 4 have a cap-shaped member 8 clamped tightly to the burner nozzle 2 by means of a bent-over edge of the mixing 'bush 5. For each aperture 4, the cap-shaped member 8 is formed by a boundary wall 9 which extends at an inclination downwards and out- I wards from the top edge of the aperture 4, and by vertical boundary walls 10, 11 disposed symmetrically on either side of the aperture 4. The boundary walls 10, 11 extend downwards to past the lower edge of the aperture 4, thus forming a groove-shaped passage 12 having a downwardly directed outlet aperture. The walls 10, 11 of the passage 12 are connected to matching walls of a passage 12' adjoining an adjacent aperture 4 by means of a cylindrical segment 13. The segments 13 are formed with axially directed grooves 14 and ribs 15 which co-operate with correspondingly formed ribs 16 and grooves 17 of the top portion of the nipple 1. At their lower ends the cylindrical segments 13 have inwardly extending edges 18 which engage in peripheral grooves 19 in the nipple 1.

The boundary walls of the passages 12 exert a cooling action on a gas-air mixture flowing through the passages, thus ensuring that the flames cannot flash back. The burner nozzle 2 is attached to the nipple 1 by means of the cylindrical segments 13, and the nozzle can be disposed in various angular positions in relation to the nipple 1 by means of the co-operating grooves and ribs 14, 15, 16 and 17. When the cylindrical segments 13 are slipped over the upper portion of the nipple, the edge 18 jumps into the groove 19, thus locating the nozzle 2 in the axial direction,

Due to the inclined boundary wall 9, the section of the inflow aperture of the passage 12 is larger than that of the air inlet aperture 4. The inflow speed of the air sucked in through the passage 12 is therefore initially low, so that only a little dust is entrained from a dusty atmosphere, and dust dropping out can escape freely in the downward direction.

FIGS. 5 and 6 illustrate an embodiment using a slightly different kind of attachment of the burner nozzle 2 to the nipple 1. The upper portion of the nipple 1 is formed with a knurling 20. The resulting depressions 21 have substantially identical dimensions in the directions of height of the nipple and in the peripheral direction, Each of the cylindrical segments 22, 23 has a pressed-in portion 24, 25. Each of the pressed-in portions 24 and 25 engages in one of the depressions 21. Cylindrical segments 26, 27 are constructed completely without depressions or projections. Instead of the knurled edge 20, the nipple 1 has the same external diameter as the portions disposed immediately above and below.

When the burner nozzle 2, with the cylindrical segments 22, 23, 26, 27 is slipped around the nipple 1, initially the nozzle 2 can readily be turned into any required position. When the right position has been reached, the nozzle 2 continues to be pushed downwardly over the nipple 1, and the pressed-in portions 24 and 25 each snap into a depression 21 as a result of the resilience of the cylindrical segments 22 and 23. 3

Since the pressed-in portions 24 and 25 are enclosed in the depressions 21 both peripherally and axially by the nipple 1, the result is a very simple method of locating the nozzles 2 in relation to the nipple 1 both axially and peripherally.

What I claim is:

1. A Bunsen burner having a gas-injection member, inlet apertures for primary air, a mixing device for the gas and the air, and a burner nozzle formed with burner apertures, characterized in that the inlet apertures for the air each have a cap-shaped member which is formed by a boundary wall extending downwardly and outwardly at an inclination from the top edge of the aperture, and by vertical, outwardly directed boundary walls .4 which are disposed symmetrically on either side of the aperture, starting from its side edges, abut by their outer edges the edges of the inclined boundary surface, and extend downwards to past the bottom edge of the aperture, 'so that each inlet aperture is adjoined by a groove-shaped passage having a downwardly directed inflow aperture for the air.

2. A Bunsen burner as set forth in claim 1, character- 1 ized in that the vertical walls are each connected by the segments engaging around that portion of the burner which comprises the injection member. 1

3. A Bunsen burner as set forth in claim 2, characterized in that one or more segments of cylinders have one or more inwardly directed projections or depressions which co-operate with depressions and projections respectively distributed regularly over the periphery of the portion comprising the injection member.

4. A Bunsen burner as set forth in claim 3, characterized in that at least one of the cylindrical portions has a projection in the form of a pressed-in portion which can co-operate with one of a number of depressions which are distributed regularly over the periphery of the portion comprising the injection member and extend axially over a short enough distance for the projection to be located both axially and peripherally in the depression.

5. A Bunsen burner as set forth in claim 3, characterized in that the projections and depressions are formed by axially directed ribs and grooves respectively, and the cylindrical segments have a portion of a circularly extending edge or groove respectively which co-operates with an associated peripheral groove or edge respectively of the portion comprising the injection member.

References Cited UNITED STATES PATENTS 10,529 2/1854 Webster et al. 431354 X 161,939 4/1875 Ehret 239-430 271,641 2/1883 Kelley 43 l354 X 1,508,403 9/ 1924 Lombardi 239566 X 3,288,377 11/1966 Van de Roer 239-557 X SAMUEL F. COLEMAN, Primary Examiner U.S. Cl. X.R. 

